CDL pre-trip - air brake system

Undercarriage - Air brake system

Click on any photo to enlarge

Proper CDL pre-trip means good troubleshooting:
PART and PROBLEM

Air tanks -- leaks, rust
Air lines -- leaks
Air brake chamber -- air leaks, cracks
Push rod -- damage
Slack adjuster -- damage, >1" travel
S-cam (not visible) -- damage



Brake shoe -- cracks, loose or missing bolts
Brake lining -- loose, missing, oil or grease, less than 1/4" on lining wear
Brake drum -- cracks, oil or grease, rust



Brakes return spring -- loose, broken, missing



Spring brakes (rear axle only) -- damage

Repeat inspection for all wheels